exact pixels or quick scale
Resize images to exact pixels online
Need a smaller thumbnail, a larger banner, or exact dimensions for a form upload? OneImageTool resizes photos and graphics right in your browser — no account, no server upload, no watermark.
Enter width and height in pixels, use quick percentage presets, or lock aspect ratio so your photo does not stretch. Export as PNG, JPG, or WebP when you are done.
three steps
How to resize an image online
Upload
Drop a JPG, PNG, WebP, or GIF. The tool reads dimensions and file size instantly.
Set size
Type target width and height, tap a 25%–200% preset, or keep aspect ratio locked while you adjust one side.
Download
Pick PNG, JPG, or WebP output and save the resized file to your device.
common jobs
When to use an image resizer
Social posts
Shrink oversized phone photos before posting or meet platform pixel limits without desktop software.
Web & email
Reduce dimensions and file weight for faster page loads and lighter newsletters.
Forms & IDs
Hit exact width × height requirements for job applications, marketplaces, or document uploads.
Print prep
Upscale or downscale reference images when you need a specific pixel canvas before export.